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Creating a button or a link to download a file from WordPress in text is pretty simple: add an image and point it to an URL of the file. In this tutorial you will learn how to programmatically download a file.
One of the problems in a WordPress Multisite is that you need to find a way to share media across all sites in the Multisite so that you can save space on your server.
Media sharing is already available with a plugin, but featured image is a different story.